实现手机扫描二维码进行登录
项目结构：
实现流程：
pc端：
1:打开二维码登录网页index.html
2:index.html调用GetQrCodeServlet
3:GetQrCodeServlet干2件事
a:生成随机的uuid,是一个唯一标识，该标识贯穿整个流程
b:生成二维码图片，二维码信息：http://xx.xx.xx.xx:8080/QrCodeLoginPro/Login.html?uuid=" + uuid
4:index页面展示二维码
5:index页面调用LongConnectionCheckServlet进行长连接轮询操作，参数为uuid
6:LongConnectionCheckServlet只干1件事
a:拿到uuid后循环检查loginUserMap中uuid是否不为null。
7:如果为null则代表没有登录，index.html将继续进行轮询
ps: LongConnectionCheckServlet 一个长连接请求检测登录状态
loginUserMap 是一个静态的map结构的登录池，uuid为key , 登录信息为value
手机端：
1:扫描pc端的二维码
2:打开二维码中的网页 http://xx.xx.xx.xx:8380/QrCodeLoginPro/Login.html?uuid=" + uuid
3:登录，将uname upwd uuid 传递给登录程序PhoneLoginServlet
4:PhoneLoginServlet干2件事
a:检测登录
b:登录成功后将登录信息插入到loginUserMap中去，uuid为key
pc端：
1:继续轮询检测uuid中是否为null
2:登录后的uuid中就不为null了，此时LongConnectionCheckServlet停止循环，返回登录状态。
代码：
cn.kuwo下的3个servlet
package cn.kuwo;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.kuwo.util.TwoDimensionCode;
/**
* 生成二维码图片以及uuid
* @author zijuntang
*
*/
public class GetQrCodeServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
//生成唯一ID
int uuid = (int) (Math.random() * 100000);
//二维码内容
String content = "http://xx.xx.xx.xx:8380/QrCodeLoginPro/Login.html?uuid=" + uuid;
//生成二维码
String imgName = uuid + "_" + (int) (new Date().getTime() / 1000) + ".png";
String imgPath = "/home/web/apache/htdocs/QrCodeLogin/" + imgName;
TwoDimensionCode handler = new TwoDimensionCode();
handler.encoderQRCode(content, imgPath, "png");
//生成的图片访问地址
String qrCodeImg = "http://xx.xx.xx.xx/QrCodeLogin/" + imgName;
String jsonStr = "{"uuid":" + uuid + ","qrCodeImg":"" + qrCodeImg + ""}";
out.print(jsonStr);
out.flush();
out.close();
}
}
package cn.kuwo;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.kuwo.vo.LoginUserVo;
import cn.kuwo.vo.UserVo;
/**
* 用长连接，检查登录状态
* @author zijuntang
*
*/
public class LongConnectionCheckServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String uuid = request.getParameter("uuid");
String jsonStr = "";
System.out.println("in");
System.out.println("uuid:" + uuid);
long inTime = new Date().getTime();
Boolean bool = true;
while (bool) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
//检测登录
UserVo userVo = LoginUserVo.getLoginUserMap().get(uuid);
System.out.println("userVo:" + userVo);
if(userVo != null){
bool = false;
jsonStr = "{"uname":""+userVo.getUname()+""}";
LoginUserVo.getLoginUserMap().remove(uuid);
}else{
if(new Date().getTime() - inTime > 5000){
bool = false;
}
}
}
System.out.println("login ok : " + jsonStr);
PrintWriter out = response.getWriter();
out.print(jsonStr);
out.flush();
out.close();
}
}
package cn.kuwo;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.kuwo.vo.LoginUserVo;
import cn.kuwo.vo.UserVo;
/**
* 二维码手机端登录
* @author zijuntang
*
*/
public class PhoneLoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public PhoneLoginServlet() {
super();
// TODO Auto-generated constructor stub
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String uuid = request.getParameter("uuid");
String uname = request.getParameter("uname");
String upwd = request.getParameter("upwd");
System.out.println(uuid);
System.out.println(uname);
System.out.println(upwd);
//TODO 验证登录
boolean bool = true;
if(bool){
//将登陆信息存入map
UserVo userVo = LoginUserVo.getLoginUserMap().get(uuid);
if(userVo == null){
userVo = new UserVo();
userVo.setUname(uname);
userVo.setUpwd(upwd);
LoginUserVo.getLoginUserMap().put(uuid, userVo);
}
}
PrintWriter out = response.getWriter();
out.print(bool);
out.flush();
out.close();
}
}
cn.kuwo.util包下的生成二维码的封装类
package cn.kuwo.util;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import jp.sourceforge.qrcode.QRCodeDecoder;
import jp.sourceforge.qrcode.exception.DecodingFailedException;
import com.swetake.util.Qrcode;
public class TwoDimensionCode {
/**
* 生成二维码(QRCode)图片
* @param content 存储内容
* @param imgPath 图片路径
*/
public void encoderQRCode(String content, String imgPath) {
this.encoderQRCode(content, imgPath, "png", 7);
}
/**
* 生成二维码(QRCode)图片
* @param content 存储内容
* @param output 输出流
*/
public void encoderQRCode(String content, OutputStream output) {
this.encoderQRCode(content, output, "png", 7);
}
/**
* 生成二维码(QRCode)图片
* @param content 存储内容
* @param imgPath 图片路径
* @param imgType 图片类型
*/
public void encoderQRCode(String content, String imgPath, String imgType) {
this.encoderQRCode(content, imgPath, imgType, 7);
}
/**
* 生成二维码(QRCode)图片
* @param content 存储内容
* @param output 输出流
* @param imgType 图片类型
*/
public void encoderQRCode(String content, OutputStream output, String imgType) {
this.encoderQRCode(content, output, imgType, 7);
}
/**
* 生成二维码(QRCode)图片
* @param content 存储内容
* @param imgPath 图片路径
* @param imgType 图片类型
* @param size 二维码尺寸
*/
public void encoderQRCode(String content, String imgPath, String imgType, int size) {
try {
BufferedImage bufImg = this.qRCodeCommon(content, imgType, size);
File imgFile = new File(imgPath);
if (!imgFile.exists())
{
imgFile.mkdirs();
}
// 生成二维码QRCode图片
ImageIO.write(bufImg, imgType, imgFile);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 生成二维码(QRCode)图片
* @param content 存储内容
* @param output 输出流
* @param imgType 图片类型
* @param size 二维码尺寸
*/
public void encoderQRCode(String content, OutputStream output, String imgType, int size) {
try {
BufferedImage bufImg = this.qRCodeCommon(content, imgType, size);
// 生成二维码QRCode图片
ImageIO.write(bufImg, imgType, output);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 生成二维码(QRCode)图片的公共方法
* @param content 存储内容
* @param imgType 图片类型
* @param size 二维码尺寸
* @return
*/
private BufferedImage qRCodeCommon(String content, String imgType, int size) {
BufferedImage bufImg = null;
try {
Qrcode qrcodeHandler = new Qrcode();
// 设置二维码排错率，可选L(7%)、M(15%)、Q(25%)、H(30%)，排错率越高可存储的信息越少，但对二维码清晰度的要求越小
qrcodeHandler.setQrcodeErrorCorrect("M");
qrcodeHandler.setQrcodeEncodeMode("B");
// 设置设置二维码尺寸，取值范围1-40，值越大尺寸越大，可存储的信息越大
qrcodeHandler.setQrcodeVersion(size);
// 获得内容的字节数组，设置编码格式
byte[] contentBytes = content.getBytes("utf-8");
// 图片尺寸
int imgSize = 67 + 12 * (size - 1);
bufImg = new BufferedImage(imgSize, imgSize, BufferedImage.TYPE_INT_RGB);
Graphics2D gs = bufImg.createGraphics();
// 设置背景颜色
gs.setBackground(Color.WHITE);
gs.clearRect(0, 0, imgSize, imgSize);
// 设定图像颜色> BLACK
gs.setColor(Color.BLACK);
// 设置偏移量，不设置可能导致解析出错
int pixoff = 2;
// 输出内容> 二维码
if (contentBytes.length > 0 && contentBytes.length < 800) {
boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes);
for (int i = 0; i < codeOut.length; i++) {
for (int j = 0; j < codeOut.length; j++) {
if (codeOut[j][i]) {
gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3);
}
}
}
} else {
throw new Exception("QRCode content bytes length = " + contentBytes.length + " not in [0, 800].");
}
gs.dispose();
bufImg.flush();
} catch (Exception e) {
e.printStackTrace();
}
return bufImg;
}
/**
* 解析二维码（QRCode）
* @param imgPath 图片路径
* @return
*/
public String decoderQRCode(String imgPath) {
// QRCode 二维码图片的文件
File imageFile = new File(imgPath);
BufferedImage bufImg = null;
String content = null;
try {
bufImg = ImageIO.read(imageFile);
QRCodeDecoder decoder = new QRCodeDecoder();
content = new String(decoder.decode(new TwoDimensionCodeImage(bufImg)), "utf-8");
} catch (IOException e) {
System.out.println("Error: " + e.getMessage());
e.printStackTrace();
} catch (DecodingFailedException dfe) {
System.out.println("Error: " + dfe.getMessage());
dfe.printStackTrace();
}
return content;
}
/**
* 解析二维码（QRCode）
* @param input 输入流
* @return
*/
public String decoderQRCode(InputStream input) {
BufferedImage bufImg = null;
String content = null;
try {
bufImg = ImageIO.read(input);
QRCodeDecoder decoder = new QRCodeDecoder();
content = new String(decoder.decode(new TwoDimensionCodeImage(bufImg)), "utf-8");
} catch (IOException e) {
System.out.println("Error: " + e.getMessage());
e.printStackTrace();
} catch (DecodingFailedException dfe) {
System.out.println("Error: " + dfe.getMessage());
dfe.printStackTrace();
}
return content;
}
public static void main(String[] args) {
String imgPath = "D:/aaa/Michael_QRCode.png";
String encoderContent = "http://xx.xx.xx.xx:8380/QrCodeLoginPro/Login.html";
TwoDimensionCode handler = new TwoDimensionCode();
handler.encoderQRCode(encoderContent, imgPath, "png");
/*
System.out.println("========encoder success");
String decoderContent = handler.decoderQRCode(imgPath);
System.out.println("解析结果如下：");
System.out.println(decoderContent);
System.out.println("========decoder success!!!");
*/
}
}
package cn.kuwo.util;
import java.awt.image.BufferedImage;
import jp.sourceforge.qrcode.data.QRCodeImage;
public class TwoDimensionCodeImage implements QRCodeImage {
BufferedImage bufImg;
public TwoDimensionCodeImage(BufferedImage bufImg) {
this.bufImg = bufImg;
}
@Override
public int getHeight() {
return bufImg.getHeight();
}
@Override
public int getPixel(int x, int y) {
return bufImg.getRGB(x, y);
}
@Override
public int getWidth() {
return bufImg.getWidth();
}
}
cn.kuwo.vo下的2个数据层
package cn.kuwo.vo;
import java.util.HashMap;
public class LoginUserVo {
private static HashMap<String, UserVo> loginUserMap = new HashMap<String, UserVo>();
private static LoginUserVo loginUserVo;
public static LoginUserVo getVo(){
if(loginUserVo == null){
loginUserVo = new LoginUserVo();
}
return loginUserVo;
}
public static HashMap<String, UserVo> getLoginUserMap() {
return loginUserMap;
}
}
package cn.kuwo.vo;
public class UserVo {
private String uname;
private String upwd;
public String getUname() {
return uname;
}
public void setUname(String uname) {
this.uname = uname;
}
public String getUpwd() {
return upwd;
}
public void setUpwd(String upwd) {
this.upwd = upwd;
}
}
2个网页
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<script type="text/javascript" src="js/jquery-1.11.0.min.js"></script>
<body>
<div id="divCon">
<img src="" id="QrCodeImg" />
</div>
</body>
<script type="text/javascript">
$(document).ready(function() {
var uuid;
$.get("/QrCodeLoginPro/GetQrCodeServlet", function(data, status) {
var obj = eval("(" + data + ")");
//存储UUID
uuid = obj.uuid;
//显示二维码
$("#QrCodeImg").attr("src", obj.qrCodeImg);
//开始验证登录
validateLogin();
});
function validateLogin(){
$.get("/QrCodeLoginPro/LongConnectionCheckServlet?uuid=" + uuid , function(data, status) {
if(data == ""){
validateLogin();
}else{
var obj = eval("(" + data + ")");
alert("登录成功了:" + obj.uname);
}
});
}
});
</script>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<style>
.l_m_l {
float: left;
font-size: 14px;
padding: 5px 0 0 0;
width: 330px;
color: #414141;
}
.l_m_linput {
height: 31px;
position: relative;
width: 300px;
margin-bottom: 21px;
}
.l_m_linput span {
float: left;
width: 78px;
text-align: right;
line-height: 31px;
}
input {
float: left;
width: 195px;
height: 24px;
line-height: 24px;
background: #f2f2f2;
border: 1px solid #c4c4c4;
padding: 2px 22px 2px 2px;
}
.l_mimacon {
position: absolute;
top: 6px;
right: 6px;
width: 15px;
height: 17px;
background: url(img/l_mimacon.png)
no-repeat;
}
.l_peoplecon {
position: absolute;
top: 7px;
right: 6px;
width: 15px;
height: 15px;
background: url(img/l_peoplecon.png)
no-repeat;
}
.l_m_lload a {
display: block;
width: 154px;
height: 40px;
background:
url(img/l_loadingbtn.png)
no-repeat;
margin: 0 auto;
line-height: 40px;
text-align: center;
font-size: 18px;
color: #52340c;
text-decoration: none;
}
</style>
<script type="text/javascript" src="js/jquery-1.11.0.min.js"></script>
<body style="background-color: #333333">
<div style="margin-left: 100px;"><img src="img/logo.png" /></div>
<div class="l_m_l">
<p class="l_m_linput">
<span><font color="#fff">用户名：</font></span><input type="text" id="login_name" value="zijuntang"><em
class="l_peoplecon"></em>
</p>
<p class="l_m_linput">
<span><font color="#fff">密码：</font></span><input type="password" id="login_psw" value="xxxxxxxxx"><em
class="l_mimacon"></em>
</p>
<div class="l_m_linput2"></div>
<div class="l_m_lload">
<a href="javascript:login();">登录</a>
</div>
</div>
</body>
<script type="text/javascript">
//登录
function login(){
$.post("/QrCodeLoginPro/PhoneLoginServlet", {
uuid : $.getUrlParam("uuid"),
uname:$("#login_name").val(),
upwd:$("#login_psw").val()
}, function(data, status) {
if(data == ""){
alert("登录失败");
}else{
alert("登录成功");
}
});
}
//获取网页参数
(function($){
$.getUrlParam = function(name){
var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
var r = window.location.search.substr(1).match(reg);
if (r!=null) return unescape(r[2]); return null;
}
})(jQuery);
</script>
</html>
web.xml配置文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<display-name>QrCodeLoginPro</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
<servlet>
<description></description>
<display-name>长连接检查登录状态</display-name>
<servlet-name>LongConnectionCheckServlet</servlet-name>
<servlet-class>cn.kuwo.LongConnectionCheckServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LongConnectionCheckServlet</servlet-name>
<url-pattern>/LongConnectionCheckServlet</url-pattern>
</servlet-mapping>
<servlet>
<description>获取二维码图片以及uuid</description>
<display-name>GetQrCodeServlet</display-name>
<servlet-name>GetQrCodeServlet</servlet-name>
<servlet-class>cn.kuwo.GetQrCodeServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>GetQrCodeServlet</servlet-name>
<url-pattern>/GetQrCodeServlet</url-pattern>
</servlet-mapping>
<servlet>
<description>手机扫描二维码之后进行登录</description>
<display-name>PhoneLoginServlet</display-name>
<servlet-name>PhoneLoginServlet</servlet-name>
<servlet-class>cn.kuwo.PhoneLoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>PhoneLoginServlet</servlet-name>
<url-pattern>/PhoneLoginServlet</url-pattern>
</servlet-mapping>
</web-app>
此外还需要1个二维码开源包：QRCode.jar
源码下载：http://files.cnblogs.com/zijun/%E4%BA%8C%E7%BB%B4%E7%A0%81%E7%99%BB%E5%BD%95%E4%BE%8B%E5%AD%90.rar
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